return - Address Offset |
|||||
| AX (CL in danger) | CX (AX in danger) | XX (CL, AX in danger) | |||
| parm
Chunk |
AL | entry | ;Preserve CL PUSH CX MOV CL,AL |
;Preserve AH MOV CX,AX |
;Preserve CL,AH XCHG CX,XX MOV CX,AX |
| exit | POP CX | XCHG AX,XX | XCHG AX,XX XCHG AX,CX |
||
| AH | entry | ;Preserve CL XCHG AL,AH PUSH CX MOV CL,AL |
;Preserve AL XCHG AL,AH MOV CX,AX |
;Preserve CL,AH XCHG AL,AH XCHG CX,XX MOV CX,AX |
|
| exit | POP CX | XCHG AX,XX XCHG AL,AH |
XCHG AX,XX XCHG AX,CX XCHG AL,AH |
||
| CL | entry | ;Ideal call MOV AL,CL |
;Preserve AX PUSH AX MOV AL,CL |
;Preserve AX XCHG AX,XX MOV AL,CL |
|
| exit | XCHG AX,XX POP AX |
XCHG AX,XX | |||
| CH | entry | ;Preserve CL XCHG CH,CL MOV AL,CL |
;Preserve AX PUSH AX XCHG CH,CL MOV AL,CL |
;Preserve CL,AX XCHG AX,XX XCHG CL,CH MOV AL,CL |
|
| exit | XCHG CH,CL | XCHG AX,XX POP AX |
XCHG AX,XX XCHG CL,CH |
||
| XX | entry | ;Preserve CL XCHG XX,CL MOV AL,CL |
;Preserve AX PUSH AX XCHG XX,CL MOV AL,CL |
;Preserve CL,AX XCHG AX,XX XCHG CL,XX MOV AL,CL |
|
| exit | XCHG XX,CL | XCHG AX,XX POP AX |
XCHG AX,XX XCHG CL,XX |
||
cp2oset MACRO ;Preferably chunk pointer in cl and returns result in ax or any other 16 bit reg or var ##IF '#1' EQ 'AH' XCHG AL,AH ##ENDIF ##IF '#1' EQ 'AH' OR '#1' EQ 'AL' ##IF '#2' EQ 'AX' ;AH (now in AL) or AL to AX: Preserve all of CX and destination not available so must use stack PUSH CX MOV CL,AL ##ELSE ##IF '#2' NE 'CX' ;AH (now in AL) or AL to anything but AX or CX: use eventual destination to save CX XCHG CX,#2 ##ENDIF ;AH (now in AL) or AL to anything but AX: Get #1 into CL and use CH to save AH or AL (now in AH) MOV CX,AX ##ENDIF ##ELSE ;not AH or AL ##IF '#2' EQ 'CX' PUSH AX ;not AH or AL to CX: Preserve all of AX and destination not available so must use stack ##ELSE ##IF '#2' NE 'AX';not AH or AL and not AX or CX XCHG AX, #2 ##ENDIF ##ENDIF ##IF '#1' NE 'CL' ;not AH, AL or CL XCHG CL,#1 ##ENDIF MOV AL,CL ##ENDIF XOR AH,AH AND CL,03 SHL AX,CL SHL AX,CL ADD AL,CL ADC AX,0 INC AX ##IF '#2' EQ 'AX' ##IF '#1' EQ 'AL' OR '#1' EQ 'AH' POP CX ##ELSE ; not AL or AH ##IF '#1' NE 'CL' XCHG #1,CL ##ENDIF ##ENDIF ##ELSE ; not AX XCHG AX,#2 ##IF '#2' EQ 'CX' ##IF '#1' EQ 'AL' OR '#1' EQ 'AH' ##ELSE POP AX ##ENDIF ##ELSE ; not AX or CX ##IF '#1' EQ 'AL' OR '#1' EQ 'AH' XCHG AX,CX ##ELSE ; not AX or CX and not AL or AH ##IF '#1' NE 'CL' XCHG #1,CL ##ENDIF ##ENDIF ##ENDIF ; not AX ##IF '#1' EQ 'AH' XCHG AL,AH ##ENDIF ##ENDIF
| file: /Techref/language/meta-l/chnkaddr.htm, 5KB, , updated: 1999/5/28 08:23, local time: 2024/11/22 00:30,
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